Police say an 18-year-old man has been arrested in connection with this incident.
Thames Valley Police say: "We are currently on the scene of an incident in Milton Keynes in which a man has been stabbed.
"The victim has been taken to the John Radcliffe Hospital in a critical condition.
"There is a large scene-watch in place in the area of Kercroft in Two Mile Ash."
Anybody who has witnessed this incident or has any information should call 101 quoting incident number 711 of 17th November.
MKFM will update this article as news comes.
UPDATE 2:45PM - Heart News has reported that police were called to the scene just after 11:33am.
An 18-year-old man has been arrested in connection with this incident.— TVP Milton Keynes (@tvp_mk) November 17, 2021
Anybody who witnessed this incident or who has any information should call 101, quoting incident reference 711 of 17 November.